Porcelain root tooth



May 28, 1929. R. M. ROBINSON 1. 14.89

PORCELAIN ROOT TOOTH Filed Aug. 5. 1922 la/w lll Patented May 28, 1929.,

warren, stares PA ENT ROBERT M. nonmson, or FULTON, vrrssoozar, ASSIGNOR I MANUFACTURING *eorv renm or. COLUMBUS, OHIO, A CORPORATION.

PORCELAIN. ROOT TOOTH.

I Application filed August 3, 1-922. Serial No. 579,386.

The object of my invention is to provide an interchangeable artificial porcelain root tooth, each tooth having'the depressions, el vations, shape and contour on'its buccal or labial face as is the general characteristic of the natural teeth it is to replace,'also a root portion, said root either to be placed in the socket (alveolus) after a recent extraction or to be placed in contact withthe soft tissues in partial edentulous cases of long standing where the soft tissues have healed'over the bony structures. Said tooth to have in com bination. a backing, said backingto cover that portion of the tooth which is subjected to the stresses and strains imposed by the antagonistic teeth of the op posite arch d uring the act ofmastii'ration; the dentist to add. to the backing such metal as is necessary torestore proper shape and contour for a masticating or incising surface. It is obvious by this ll'lQtllOCl that the porcelain is well protected.

Hitherto the dentist has been obliged to select an artificial tooth as sold by the manufacturers and add porcelain to it. It was necessary that the dentist have exceptional skill to manipulate the porcelain from its finely powdered state until it was glazed for F or esthet1c and y application in the mouth.

physiological reasons, 1t 15 necessary that teeth have de )IGSSlOIlS elevations sha )e and contour similar to the generalcharacteristics V for the blending of shades of the type teeth theyare tojreplace in the mouth." This requires the skill of an artist colors), the skill of a sculptor for the carving of the proper shapes and contours, and the experience of a porcelain worker for making the tooth body. It is obvious that'the dentist finds it diflicult to produce a satisfactory article, to say nothing of the expensive equipmentand the time consumed 1n making the tooth.

My improved tooth is manufactured with certain standards of dimension making it interchangeable with its backing, thus it is replaceable (interchangeable) in the mouth, and should breakage occur, a new teeth can accurately and'q'uickly besupplanted. The

said tooth has the depressions, elevations,

striations, shape and contourof its labial or buccal surface as is the general characteristic of the type tooth it is to replace in the mouth, which therefore, adds materially to its esthetie value and. its physiological function.

The said tooth further has as a part thereof, an artificial rootwhich is made to be 'tooth and my improved posed and a be circular eter throughout its entire length as shown in placed in a tooth socket (alveolus) of recent extraction or to rest on the soft tissues of the edentulous part of the ridge. The said artificial porcelain root is highly advantageous for its estheti'c value, its sanitary effect (there betooth-has been recently extracted, the tissues I will close in firmly around it preserving'substantially the natural appearance of the gums. Whereas without the porcelain root the tissues absorb leaving a larger space than existed prior to the extraction; i

- Inthe drawings: I Figure 1 is a side elevation of my improved backing detached therefrom, and carrying acusp, F ig. 2 is a similar view with the and cusp attached to the tooth,

Fig. 3 is a perspective view lookingat the lingual face of my improved tooth, and

- Fig. 4: is a bottom plan view of the backing. In the claim the word buccal and the word labial will be used as synonyms. The tooth is divided into a crown portion v backing- ToTHE eoLuMBiIs DENTAL ing no sharp angles or pores to collect food debris or calculous deposits from the saliva) :1 anda, root portion 2. The crown portion as a buccal or labial face 3, and a fiat plane 4, disposed atan angle to the long axis of the tooth X, Y (in the accompanying tooth measextending inward i. e.,- bucally centrally disv parallel with said fiat plane 4:, and terminating at a point within the buccal or labialhalf of the tooth. The post. hole may in cross section and of one diamthe drawings, or circular incross section and tapered, the diameter decreasing as the inner-I most endis approached, or it may be elliptical 1n crosssection and either tapered or. of one diameter throughout its entire length. The slot'5 has substantially two parallel lateral walls and a third wall 5" at its buccal or labial end or extremity. v The slot does not extend the full length of the post hole 6, but ends perceptibly short of the bueeal or labial extremity of the post hole. 3 a

The root 2 may be either conically shaped or have a hollowed out saddle effect, 11.1 The surmoun backing 7is flat and adapted to have a close fit With the flat plane provided on its gingival :face with tedby a postS Whioh post is-of greater diameter than the rib, the backing,rib and post being eoinplen'iental with the fiat plane,

I have shown in Figures 1 and 2 of the drawings a metal cusp 12 secured to the backin 7- V:

' elaimis:

rnteoui compringa crown portion and 4c of the tooth, and is the slot and post hole of the tooth.

an integral root portion, the Crown portion terminating occlusally in, a single flat plane a rib 9' tire oeolusal area, a post hole having its ori- 'fice'in the lingual face of the tooth and extending inwardly labially and'centrajlly disposed and parallel with the part of its length tothe said flat plane of i the tooth. I

In testimony whereof I aifiX' my slgnat'uia V ROBERT ROBINSON.

l fiat plane, a slot of less diameter opening said post hole for a 

